- static Performance *unsmob (SCM p) {
- return dynamic_cast <Performance *> (Music_output::unsmob (p));
- }
- static bool is_smob (SCM p) {
- return Music_output::is_smob (p) && unsmob (p);
- }
+ SCM get_header () const;
+ void set_header (SCM header);
+
+ virtual void derived_mark () const;